Tetra-n-butylammonium Borohydride Semiclathrate: A Hybrid Material for Hydrogen Storage

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In this study, we demonstrate that tetra-n-butylammonium borohydride [(n-C(4)H(9))(4)NBH(4)] can be Used to form a hybrid hydrogen storage material. Powder X-ray diffraction measurements verily the formation of tetra-n-butylammonium borohydride semiclathrate, while Raman spectroscopic and direct,as release Measurements confirm the storage of molecular hydrogen within the vacant cavities. Subsequent to clathrate decomposition and the release of physically bound H(2), additional hydrogen was produced from the hybrid system via a hydrolysis reaction between the water host molecules and the incorporated BH(4)(-) anions. The additional hydrogen produced from the hydrolysis reaction resulted in a 170% increase in the gravimetric hydrogen storage capacity, or 27% greater storage than fully Occupied THF + H(2) hydrate. The decomposition temperature of tetra-n-butylammonium borohydride semiclathrate was measured at 5.7 degrees C, which is higher than that for pure THF hydrate (4.4 degrees C). The present results reveal that the BH(4)(-) anion is capable of stabilizing tetraalkylammonium hydrates.
Publisher
AMER CHEMICAL SOC
Issue Date
2009-06
Language
English
Article Type
Letter
Keywords

QUATERNARY AMMONIUM-SALTS; CLATHRATE HYDRATE; MOLECULAR-HYDROGEN; BORANE HYDROLYSIS; BUTYL; FLUORIDE; TETRABUTYLAMMONIUM; TRANSITION; INCLUSION; STABILITY

Citation

JOURNAL OF PHYSICAL CHEMISTRY A, v.113, no.23, pp.6415 - 6418

ISSN
1089-5639
DOI
10.1021/jp902547d
URI
http://hdl.handle.net/10203/93456
Appears in Collection
CBE-Journal Papers(저널논문)
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